Transmission lock-up recall 24V797, FPDCM stall, false DEF warnings, brake recall 24V674. Yukon diesel problems may qualify for a California buyback.
The 2021-2024 GMC Yukon with the 3.0-liter Duramax diesel engine (RPO LM2) was marketed as the fuel-efficient alternative in the full-size SUV segment — better highway range, strong low-end torque, and a premium powertrain option. What owners were not told is that this specific drivetrain combination has accumulated one of the densest recall and TSB records in the Yukon lineup. Four separate NHTSA recalls target the LM2 diesel Yukon, along with four Technical Service Bulletins — covering the engine, fuel system, transmission, brakes, and emissions system across nearly the entire 2021-2024 production run. The most serious issue is the transmission control valve defect on 2021 MY diesel Yukons (recall 24V797), where wear in the 10-speed automatic's control valve can cause momentary rear wheel lock-up during a highway downshift. GM issued a stop-delivery order on October 24, 2024, before owner notification letters were even sent — a sequence that confirms GM understood the safety risk before most owners had any warning. The roughly 2,980 affected GMC Yukon diesel units also face a compounding problem: the recall's TCM software remedy limits the transmission to 5th gear when excessive valve wear is detected, but it does not repair the worn hardware itself, meaning owners who experienced harsh shifting before the recall may have ongoing drivetrain damage that the software patch does not fully address. The fuel system story on the 2021 MY diesel is similarly layered. TSB PIP5964 identifies an internal short in the Fuel Pump Driver Control Module (FPDCM) that causes engine stalling, no-start, rough idle, and loss of acceleration — overlapping in symptom with recall 21V739, which covers a related but distinct fuel pump power control module failure. Both bulletins cover 2021 Yukon diesel units. Owners who presented for one of these stall/no-start complaints may have received only a partial repair. On the emissions side, TSB 18-NA-361 (updated December 2022 for LM2 SUVs) documents a software anomaly causing false DEF system warnings and no-start conditions on 2021-2023 diesel Yukons — even when the physical DEF system is functioning correctly. Multiple dealer visits to diagnose DEF warnings that return after an ECM reprogram are a documented same-defect repeat pattern under California law. If you own a 2021-2024 GMC Yukon diesel, your vehicle's repair history across these overlapping systems may already be enough to support a California lemon law claim.
The issues owners report most, ranked by severity — each one verified against a cited NHTSA source.
Engine stalls unexpectedly while driving; vehicle will not restart; rough or erratic idle; accelerator pedal unresponsive; loss of power or acceleration; fuel gauge reads incorrectly or goes to zero; check engine light on; erratic shifting
Harsh or rough shifting; sudden jolt or lurch during deceleration or downshifting; momentary rear wheel lock-up or skid while driving at highway speed; vehicle instability; ABS or stability control activates unexpectedly; transmission hesitation or refusal to shift
No brake warning light displayed when brake fluid is low; brake pedal feels soft, spongy, or travels to floor before driver receives any dashboard warning; vehicle has reduced braking performance without any indication on the instrument cluster
Check engine / malfunction indicator lamp on; dashboard displays 'Service Emission System' message; 'DEF Level Low' warning displayed even when tank is full; vehicle may go into limp mode or reduced power mode; in some cases vehicle will not start
Engine oil leak visible on driveway or garage floor; burning oil smell from engine bay; low oil level warning on dashboard; oil drips or staining around the turbocharger or front of the engine; in severe cases, oil smoke from engine compartment
Shudder, shake, or vibration felt through vehicle at steady speed or during light acceleration between 25 and 50 mph; vibration that feels like driving over rumble strips; may be intermittent; may worsen over time or appear after a cold soak
A settled Margarian Law case on this exact model, published with the actual settlement math.
Open any defect for the symptoms and why it matters for a California lemon-law claim. Each is tied to a cited NHTSA source.
Engine stalls unexpectedly while driving; vehicle will not restart; rough or erratic idle; accelerator pedal unresponsive; loss of power or acceleration; fuel gauge reads incorrectly or goes to zero; check engine light on; erratic shifting
Stalling while driving at highway speed is a per se safety defect under California law. GM issued TSB PIP5964 documenting the FPDCM internal short as a known condition, confirming prior knowledge. For 2021 MY diesel Yukons, recall 21V739 (fuel pump power control module stall) also covers this failure mode — a client who had 21V739 repaired but later experienced the FPDCM-related stall has documented a same-system repeat-repair pattern under Song-Beverly. TSB data establishes GM's knowledge across 2021-2023 MY diesel models before many failures occurred, which is directly relevant to willfulness arguments.
Per TSB PIP5964/PIP5964D: technician diagnoses and replaces the K111 Fuel Pump Driver Control Module (FPDCM) at no charge under warranty or as covered by recall 21V739 for 2021 MY. Outside warranty period, FPDCM replacement is a dealer-directed repair.
Harsh or rough shifting; sudden jolt or lurch during deceleration or downshifting; momentary rear wheel lock-up or skid while driving at highway speed; vehicle instability; ABS or stability control activates unexpectedly; transmission hesitation or refusal to shift
Rear wheel lock-up at highway speed is a catastrophic safety defect and represents a per se substantial impairment under Song-Beverly. The stop-delivery order issued October 24, 2024 confirms GM knew this was a safety risk before notifying owners. Diesel-only scope of this recall is legally significant — it demonstrates a powertrain-specific defect affecting a premium diesel option. Any 2021 diesel Yukon owner who experienced harsh shifting, jolt events, or ABS activation consistent with this defect should be evaluated whether the TCM software update was performed and whether wheel lock-up occurred. Clients with multiple transmission-related repair visits (harsh shifting → TCM update → continued complaints) have a strong repeat-nonconformity claim.
Under recall 24V797: dealers install updated Transmission Control Module (TCM) software that monitors valve wear and triggers a 'limp mode' (5th gear limit) if excess wear is detected approximately 10,000 miles before wheel lock-up could occur. A special coverage program additionally covers full transmission replacement if the control valve is found to be defective.
No brake warning light displayed when brake fluid is low; brake pedal feels soft, spongy, or travels to floor before driver receives any dashboard warning; vehicle has reduced braking performance without any indication on the instrument cluster
100% of affected 2023-2024 Yukon/Yukon XL vehicles (all variants including diesel) have this defect — it is present from the factory, not a wear-based failure. FMVSS 135 noncompliance from delivery is a per se defect under California law. The defect conceals a safety hazard from the driver, eliminating the driver's ability to protect themselves and others from a brake failure. Any 2023-2024 diesel Yukon client with brake system complaints should be checked for 24V674 remedy status immediately. An unrepaired vehicle with a subsequent brake failure or accident creates heightened liability exposure.
Under recall 24V674: eBCM software updated via over-the-air (OTA) update (for capable vehicles) or dealer visit, at no charge. Production fix implemented for vehicles built after August 1, 2024.
Check engine / malfunction indicator lamp on; dashboard displays 'Service Emission System' message; 'DEF Level Low' warning displayed even when tank is full; vehicle may go into limp mode or reduced power mode; in some cases vehicle will not start
A vehicle that enters limp mode or refuses to start due to a false DEF fault is substantially impaired in its use, value, or safety. A client who returned for the same DEF/emission system warning after ECM reprogramming has a documented same-defect repeat pattern. GM's TSB covers 2021-2023 MY — if a client's vehicle received the ECM reprogram and the DEF warnings returned, that visit sequence is a textbook Song-Beverly pattern. Note also that a DEF system limitation (vehicle forced into limp or no-start) can strand the owner, which may overlap with stall/no-start claims under iss-01.
Per TSB 18-NA-361: ECM software reprogramming at the dealership resolves the false fault condition. No hardware replacement required if the DEF system itself is intact.
Engine oil leak visible on driveway or garage floor; burning oil smell from engine bay; low oil level warning on dashboard; oil drips or staining around the turbocharger or front of the engine; in severe cases, oil smoke from engine compartment
Engine oil leaks from a factory-installed diesel drivetrain are a substantive reliability defect. The existence of GM TSB 23-NA-011 specifically identifying the LM2 leak locations demonstrates manufacturer acknowledgment of a design or material deficiency. Clients with repeat oil leak repairs (e.g., oil cooler seal fixed, then turbo line leak, then return tube leak) are experiencing the same overall issue from a related root cause, supporting a cumulative-repair pattern claim. If oil loss resulted in low-oil shutdowns or engine damage, severity escalates to Safety/Catastrophic.
Per TSB 23-NA-011: inspect oil cooler cover, upper turbo oil supply line, and related seals; replace failed seals and any damaged components. Turbo oil return tube replacement addressed separately per MC-10242782-9999.
Shudder, shake, or vibration felt through vehicle at steady speed or during light acceleration between 25 and 50 mph; vibration that feels like driving over rumble strips; may be intermittent; may worsen over time or appear after a cold soak
TSB 24-NA-167 applies to the full 2021-2024 MY range with the MQC 10-speed — confirming GM acknowledged this transmission calibration problem persisted for the entire production run of the vehicle. Clients who received a TCM reprogram and subsequently reported the same shudder have a documented repeat-repair pattern. Note that the diesel variant also carries recall 24V797 (iss-02) for transmission valve wear — a client with both shudder complaints AND the 24V797 transmission hardware defect has overlapping transmission system claims that should be evaluated jointly.
Per TSB 24-NA-167: dealer checks for latest TCM calibration and reprograms/updates TCM software. No hardware replacement required unless valve body or torque converter is also damaged.
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2022 and 2024 GMC Yukon vehicles equipped with 6-cylinder diesel (RPO LM2) where the original fuel tank was replaced in dealer service with an incorrect 2025 MY redesigned tank. The 2025 tank is physically different and not compatible with 2021-2024 MY fuel line and vent valve connections, allowing fuel to leak in a rollover crash.
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On diesel-equipped 2021 GMC Yukon and Yukon XL, the 10-speed automatic transmission control valve may be susceptible to excess wear over time, causing gradual loss of hydraulic pressure and increasingly harsh shifting. In rare cases the wear can result in momentary rear wheel lock-up during a downshift from 8th gear.
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eBCM software mismatch with calibrations (supplied by ZF North America) causes the BRAKE telltale to fail to illuminate when brake fluid drops to the level required by FMVSS 135, concealing a brake fluid loss condition from the driver. Applies to all engine variants including diesel.
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The fuel pump power control module may contain a supplier manufacturing defect that causes the fuel pump to fail or operate intermittently, resulting in an unexpected engine stall while driving. Confirmed to include diesel-equipped 2021 GMC Yukon/Yukon XL.
Every item below comes from this vehicle's documented defects. The more you recognize, the more a free case review is worth your time.
California's Song-Beverly Consumer Warranty Act gives you legal protection when a manufacturer cannot repair a covered defect after a reasonable number of attempts during your warranty period. For safety-related defects — such as unexpected engine stall while driving, transmission lock-up at highway speed, or a brake warning that does not function — two repair attempts without resolution may be enough to trigger the protections. For non-safety defects like DEF system false warnings, oil leaks, or transmission shudder, four repair attempts, or 30 or more cumulative days out of service during the warranty period, may be sufficient. If your diesel Yukon qualifies, you may be entitled to: a full vehicle repurchase (the price you paid, minus a mileage offset for miles driven before the first reported repair), a comparable replacement vehicle, or a negotiated cash settlement. Under Song-Beverly § 1794(d), GM — not you — pays your attorney fees if you prevail. That means many California lemon law claims cost the owner nothing out of pocket to pursue. Owners of 2021 Yukon diesel vehicles who experienced harsh shifting or stall events before recall 24V797 was announced, and who were told at the time the vehicle was 'operating normally,' may have a particularly strong willfulness argument — the stop-delivery order issued before owner notification demonstrates GM's knowledge of the risk. The above is general legal information only — it is not legal advice, and every case depends on its specific facts, dates, mileage, and repair records.
“Could not duplicate” doesn't mean the defect isn't real. Here's exactly what to do to protect a potential California lemon-law claim.
Document the moment it happens. Photos, video, and screenshots of any warning lights — with the date and the mileage.
Get a repair order every visit — even “found nothing.” That paperwork is the foundation of a claim.
Check your VIN at nhtsa.gov/recalls. Note any recall that has no available remedy yet.
Track your out-of-service days. California law counts the cumulative days your vehicle spends in the shop.
Keep loaner & rental records. Alternate-transport paperwork during long repairs matters.
Save everything in one place. Symptoms, dates, repair orders, and every repeat visit — the intermittent ones especially.
A repair order marked 'unable to duplicate' (UTD) or 'no trouble found' (NTF) is not the end of the road — it starts your paper trail. Here is how to protect yourself before and during every dealer visit on a Yukon diesel: 1. Document before every visit. Note the exact warning message, date, time, mileage, weather, recent driving conditions, and whether you were towing. Photograph any lit warning lights. For DEF warnings, note the exact DIC message wording. For stall events, note exact speed and whether it happened under acceleration, steady throttle, or deceleration. 2. Ask for diagnostic trouble codes in writing — including stored and historical codes — even if the warning cleared before you arrived. The FPDCM short and DEF software anomaly frequently leave stored codes even after the condition clears. DTCs P129F and P023F are specifically associated with the FPDCM defect in TSB PIP5964. 3. Reference these bulletins by number at the service desk: TSB PIP5964 and recall 21V739 (fuel stall/no-start, 2021-2023 LM2); TSB 18-NA-361 (false DEF warnings, 2021-2023 LM2); recall 24V797 (transmission lock-up, 2021 diesel); TSB 23-NA-011 (oil leaks, 2021-2024 LM2); TSB 24-NA-167 (transmission shudder TCM calibration, 2021-2024 LM2); recall 24V674 (brake warning light, 2023-2024). Ask the service advisor to confirm which of these open items apply to your VIN before authorizing any repair. 4. If your 2021 Yukon diesel received only the TCM software update under recall 24V797 and the transmission continues to shift harshly or shudder, that is a documented same-system post-remedy failure. Return to the dealer and ask specifically whether the valve hardware replacement under the special coverage provision applies to your VIN. 5. If your diesel Yukon has been diagnosed with false DEF warnings and received an ECM reprogram, but the 'Service Emission System' message returned later, that is a textbook same-defect repeat-repair pattern under Song-Beverly. Keep both repair orders. 6. Track cumulative days out of service. With multiple overlapping defects — engine stall, DEF warnings, transmission repair, oil leaks — Yukon diesel owners often accumulate out-of-service days faster than owners of a single-issue vehicle. 30 or more cumulative days is an independent lemon law qualifying threshold.
The 2021-2024 GMC Yukon diesel occupies a difficult position: it is the same exterior vehicle as the gasoline Yukon, but the diesel drivetrain introduced a distinct and layered set of documented defects that the gasoline variant does not share — including diesel-exclusive recalls on the transmission, fuel system, and fuel tank, plus a DEF system software defect that lingered across three model years before a full TSB remedy was documented. The transmission recall (24V797) is particularly instructive: GM issued a stop-delivery order before mailing owner notification letters, which means the company understood the risk to existing owners before those owners were given a chance to respond. If you have a 2021 Yukon diesel that has visited the dealer for harsh shifting, stalling, or DEF warnings — and those problems have recurred — your repair records may already document the kind of pattern that qualifies under California law. We encourage Yukon diesel owners to gather all repair orders, including UTD visits, before their factory warranty period closes and have them reviewed.
— The Margarian Law team
Has your Yukon diesel stalled on the highway, refused to start, or thrown 'Service Emission System' warnings — even after a dealer visit? Has the transmission shifted harshly or shuddered through multiple repair attempts? If you own a 2021-2024 GMC Yukon diesel and have been back to the dealer more than once for any of these issues, your service records may already qualify you for a buyback under California law. The consultation is free and, if you have a case, GM pays your attorney fees. Find out where you stand.
Yes. NHTSA recall 24V797, effective October 24, 2024, covers approximately 2,980 GMC Yukon units from the 2021 model year equipped with the 3.0-liter LM2 Duramax diesel engine and 10-speed automatic transmission. Wear in the transmission control valve can cause hydraulic pressure loss and, in the most severe cases, a momentary rear wheel lock-up during a downshift at highway speed — substantially increasing crash risk. The recall remedy is a TCM software update that monitors valve wear and limits the transmission to 5th gear when excessive wear is detected. However, the software fix does not repair worn valve hardware. If your 2021 Yukon diesel has had repeat harsh shifting complaints before or after the recall remedy, those visits may support a Song-Beverly repeat-nonconformity argument. Owner letters were mailed December 11, 2024. Check recall status for your VIN at nhtsa.gov.
Yes. Two overlapping bulletins apply to 2021-2023 GMC Yukon diesel owners experiencing stall, no-start, or loss of power symptoms. GM Technical Service Bulletin PIP5964 (issued February 2024, revised March 2024) identifies an internal short in the K111 Fuel Pump Driver Control Module (FPDCM) as a root cause — the short interrupts the fuel pump signal, causing unexpected stall, rough idle, loss of acceleration, and no-start. The associated diagnostic codes are P129F and P023F. For 2021 model year diesel Yukons, NHTSA recall 21V739 covers a related — but distinct — fuel pump power control module that can also cause unexpected stall. If your dealer repaired one component but the stall returned, the other module may not yet have been addressed. Stalling at highway speed is a safety defect under California law, and even two repair visits without resolution may be sufficient to support a Song-Beverly claim.
It may be. GM Technical Service Bulletin 18-NA-361 (updated December 2022 for 2021-2023 LM2 applications) identifies an ECM software anomaly that triggers false DEF system fault codes even when the physical DEF system is functioning correctly. The result is 'Service Emission System' and 'DEF Level Low' messages in the Driver Information Center, sometimes accompanied by a no-start condition or speed-restriction countdown — all without any actual DEF hardware failure. The remedy is ECM reprogramming; no hardware replacement is needed if the physical DEF components are intact. If the messages returned after your dealer reprogrammed the ECM, or if the dealer cleared codes without identifying a root cause, that second visit for the same complaint is a documented repeat-repair attempt. Under Song-Beverly, repeat visits for the same system defect are cumulative — they do not reset simply because the code was cleared.
Yes. NHTSA recall 24V674 applies to all 2023 and 2024 GMC Yukon and Yukon XL vehicles, including the LM2 diesel variant. The defect is a software mismatch in the electronic brake control module (eBCM) — the BRAKE warning telltale fails to illuminate when brake fluid drops to the level required by federal safety standard FMVSS 135. This is not a wear-related failure; every affected vehicle carries the defect from the factory because the eBCM software and calibration files were mismatched at the supplier (ZF North America). The remedy is an eBCM software update, available via over-the-air (OTA) update for eligible vehicles or through a free dealer visit. Owner notification was mailed October 28, 2024. Confirm whether the remedy has been completed on your VIN at nhtsa.gov.
Yes. GM Technical Service Bulletin 23-NA-011 (issued February 2023, updated 2024) specifically identifies two external oil leak points on the 3.0-liter LM2 Duramax diesel engine: the oil cooler cover seal and the upper turbo oil supply line seal. Both locations are unique to the diesel engine — they do not appear on the gasoline Yukon variants. A separate bulletin also covers turbo oil return tube leaks. The TSB covers 2021-2024 Yukon and Yukon XL with the LM2 engine. If your Yukon diesel has been back to the dealer for oil leaks on more than one occasion, and the leak recurred from the same location or a related LM2-specific seal, that is a documented same-defect repeat-repair pattern. Under Song-Beverly, cumulative repair attempts across related components of the same system count together — they do not reset between visits.
It may, depending on your model year and repair history. California's Song-Beverly Consumer Warranty Act presumes a vehicle is a lemon if: the manufacturer has made two or more repair attempts for a safety-related defect without resolving it; four or more repair attempts for any substantial defect; or the vehicle has been out of service for 30 or more cumulative days during the warranty period. For the Yukon diesel, the most common qualifying patterns are: multiple visits for engine stall under TSB PIP5964 or recall 21V739 on a 2021 model; repeated DEF system warnings (false 'Service Emission System' messages) after ECM reprogramming under TSB 18-NA-361; or transmission complaints before and after recall 24V797 on 2021 diesel models. Because diesel Yukons often face multiple simultaneous open issues, cumulative out-of-service days can accumulate faster than owners expect. Gather all your repair orders — including UTD visits — and have them reviewed by a California lemon law attorney. If you prevail, GM is responsible for your attorney fees under § 1794(d).
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